Mozilla Products (Host:) Buffer Overflow Denial of Service String

2005-09-09 00:00:00


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Mozilla Firefox <= 1.0.6 (Host:) Buffer Overflow DoS String
Formatted for your tesing /str0ke

Tom Ferris
www.security-protocols.com

Versions Affected:
Firefox Win32 1.0.6 and prior
Firefox Linux 1.0.6 and prior
Firefox 1.5 Beta 1 (Deer Park Alpha 2)

Technical Details:
The problem seems to be when a hostname which has all dashes causes the
NormalizeIDN call in nsStandardURL::BuildNormalizedSpec to return true,
but is sets encHost to an empty string. Meaning, Firefox appends 0 to
approxLen and then appends the long string of dashes to the buffer
instead. The following HTML code below will reproduce this issue:

String:
<A HREF=https:--------------------------------------------- >

-->

<A HREF=https:­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ >

#

Fixes

No fixes

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